Means for punching rivet-holes in sheet-metal pipe-sections.



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' L'IVINGSTHE. MEANS FOB PUNCHIG. RIVE! -HULE'S IN SHEET'MEJ'ALVPIP SECTIUNS.

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No. 7l2',43`5. Patented 001.28, |902.

l. M. LIVINGSTUNE. `MEANS FOR'PUNCHING IVET HULES IN SHEET METAL PIPE SEGTINS.4

med nu. 1-7, 1902. f

(Application (No Model.)

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GEORGEM.`LIVIYNGS`TONE, OF DENVER, COLORAD.

MEANS FOR PUNCHlNG RlVET-HOVLES` IN SHEET-METAL PIPE-SECTIONS.

SPECIFICATION forming part of Letters Patent No. 712,435, dated October 28, 1902. Application sied nach 17,1902. semina. 98,638. (Nomad.)

T0 LZZ whom, t nutty concern:

Be it known that I, GEORGE M. LIVINGL STONE, a citizen1 of the United States of America,"A residing at Denver, in the county of Arapahoe and Statev of Colorado, have invented certain new and useful Improvements in Means for Punching Rivet-Holes in Sheet- Metal Pipe-Sections5 and I do declare the fol` lowing to be afull, clear, and exact description of the invention,` such as will enable others skilled in the art to which it appertains to make and use the same, reference being had tothe accompanying drawings, andto the let-l tersand gures of reference marked thereon,` which form a part of this specification.

Myinvention relates generally to improvements in the manufacture of sectional sheet-4 lnetal piping for smoke-stacks and kindred uses, and particularly to means forpunching the rivet-holes in theoverlapping extremities of the sheet-metal sections to cause said holes to register. The necessity1 for my improvement exists by reason of the fact that the inside lap of the overlapping extremities of these sections is less in circumference than the outside lap. `Hence if` the rivet-holes are punched the same distance apart in both laps they will not exactly register. It isfound in practice that when sheet metal one-eighth of an inch thick is used there will be approximately three-eighths of an inch dierence in circumference between the inside and outside laps. Hence in order that the rivet-holes may register those' of the inner lap must be punched nearer together than thoseof the outer lap.

My improvement consists of adjustable dies, male and female, so constructed that both may be quickly and accurately changed to punch these hole the proper distance apart in both laps of the plates. These holes are of course punched While the metal sections are in flat sheets of the prope size. My improved device is first adjusted to punch the holes the proper distance apartin one edge of the sheets-say,'for instance, the edge to form the outside lap. The'n holes are then first punched in the corresponding edges of all the sheets to form the pipe of the desired length. The dies are then adjusted to bring their punches and counterpartpunch-holes slightly nearer together, after which the holes will be thrust.

punched in the opposite edges of the sheets or the edges which will form the inside lap in assembling the sheet-metal pipesections.

Having outlined in a Very general Way my improvement and the objects to be `accomplished thereby, I will proceed to describe the same in detail, reference being made to the accompanying drawings, in which is illusi trated an embodiment thereof.

In the drawings, Figure 1 is an underneath View of the male member of my improved construction, the transverse sections or parts being shown in a positionat right angles to the `parallel longitudinal side pieces or bars, to

which the extremities of the cross pieces or sections are pivoted. c Fig. 2 is a similar view ofV the same, showing the cross-pieces adjusted to form oblique angles with theside bars, bringing the punches slightly closer together than in Fig. 1. Fig. 3 is asection taken onthe line mx, Fig. 1. Fig. 4 is a top or plan View of the female die or memberof myimproved construction. Fig. 5 is a section taken through the two die members mounted in operative relation, showing a piece of sheet metal in place ready to be punched. Fig. 6 is a plan View in detail of one of the die-sections.

The same reference characters indicate the same parts in all the views.

Let the numerals 5 and 6 designate two parallel longitudinal side bars, which, as shown in thedrawings, (see Figs. 3 and 5,) are provided with grooves adapted to receive counter art tongues 7 formed on a series of t! Y 7 transverse sections 7, in each of which is set a solid punch S. The extremities of these sections 7 are pivotally connected with their respective side bars 5 and 6 byscrew-studs 9 and 9. The punch-pins are so arranged on the series of the sections, as shown in Fig. 1, that they lie ina straight line drawn diagonally across the rectangular space inclosed on two sides by the parallel bars 5 and 6. The bar 5 is made fast to a chase or frame 10 by bolts 12. This frame is provided with side flanges 10 and end flanges 10, the bar 5 occupying a position against or in contact with the adjacent side flange 10 of the frame,

while bolts 13 are threaded in the opposite side ange and engage the adjacent edges of the bar 6 for holding it in place by a lateral This bar 6 is longitudinally adjust- IOO able. It is secured to the frame by bolts 14, passing through slots 6a, formed in the bar. The opposite ends of the bar 6 are engaged by bolts and 16, respectively, threaded in the end flanges 10c of the frame. By loosening the nuts of the bolts 13 the bar 6 maybe moved to throw the sections 7 to a position forming oblique angles with the side bars. For convenience of description I will designate the series of punches 8, extending from the left toward the right, referring to Figs. 1 and 2, by the letters of the alphabet A to P, inclusive. Since the punches 8 of The series of die-sections 7 are arranged ina diagonal line across the space between the two parallel bars 5 and 6, the punch A of the section farthest to the left being farthest from its pivotal-center or the screw-studi), the punch P of the section 7 farthest to the right being nearest itsl pivotal center or stud 9, and the intermediate punches at varying distances between these extremes from their respective pivotal centers, the saiddistance decreasing from theleft toward the right. on a straight line passed through the punches, it is evident that if the bar 6 be shifted endwise to move all the sections 7, as indicated in Fig. 2, the punch P farthest to the right or nearest its center of motion will describe an are having a very short radius, and consequently will have little movement, While the punch O of the next section 7 toward the left will describe an arc having a slightlygreater radius, and therefore will have a correspondingly greater movement than the punch P. Hence the resultis thatthe distance between the punch O and the pu nchPhas been slightly lessened by the operation. From this it will plainly appear that each punch in succession from P toward the left will move a greater distance than the adjacent punch on the right, the general result being to cause the punches to approach each other, bringing the punches A and P nearer together a predetermined distance and the successive punches nearer together by a fraction of this distance.

The female die member (shown in detail in Fig. 4) is very similar in constructionto the male die member. This female member is composed of two parallel side bars 17 and 18, secured to a chase or frame 19 by bolts 2l and 22, respectively, the bar 17 being made fast to the frame, while the bar 18 is adjustable, the bolts 22 passing through slots 23, formed in the bar. The two bars 17 and 18 are connected by transverse sections 20,whose extremities are pivoted on screw-studs 24 and 25. rIhese sections are provided with openings 20, diagonally arranged across the rectangular space between the two parallel bars in such a manner as to register and coperate with the punches 8 of the male die member. The bar 18 is held in position by side bolts 26 and end bolts 27.

When the apparatus is in use, the male and female die members are arranged one above the other, as shown in Fig. 5, theframe of the male member being attached to the plunger 28 of a stamping-press, while the frame of the female member is mounted on a stationary bed 29. These die members are so arranged that the punches of the one member and the holes of the other member are located along the edge of the sheet-metal plate or section 30 to be perforated. In order to do this, it will be understood that the parallel side bars must occupy a position forming angles with the edges of the sheetmetal sections. If the construction shown in 'Fig 2 were turned over and placed above the construction shown in Fig. 4, the punches of the one member and the holes of the other member would be in alinement or register with one another, the two members in this event occupying the relative positions shown in Fig. 5. Assuming that the edge ofthe metal sheet which is to form the outside lap in the pipe is tobe punched first, I will suppose that the movable transverse sections of the die members are in position to form right angles with the parallel side bars, these sections of the two members in this event occupying the position of the radius of the male member in Fig. 1. All the sheet-metal plates which are to be formed for a certain structu re-as a smoke-stack,forinstance--are then punched on one edge-namely,the edge which is to form the outside lapin the pipe. `After this has been done the screw 16 and the nuts of the bolts 14 are loosened and the screw 15 turned to force the bar 6 toward the right, referring to Fig. 1, whereby the sections 7 are made to occupy the position shown in Fig. 2, it being assumed that this is the degree of movement required for the purpose heretofore explained. The female die member is also correspondingly adjusted in like manner. After this is done and the nuts on the bolts 14 and 22 are tightened the apparatus is ready to punch the holes along the opposite edges of the plates or the edges` which are to form the inside lap when the plates are assembled in the pipe. The rivetholes of the two laps will then register, when the sheet-metal plates or sections are assembled.

Having thus described my invention, what I claim is-l 1. In means for punching rivet-holes in sheet-metal pipe-sections, the combination of male and female cooperating die members, each comprising a suitable chase or frame, parallel side bars secured to the frame, one of them being adjustable thereon, and transverse sections whose extremities are respectively pivoted to the side bars; the transverse sections of the male member having punches arranged in a diagonal line across the rectangular space between the two side bars; and the corresponding sections of the female member being provided with openings similarly arranged to register with the punches of the male member when the two members IOC IIO

' longitudinal side bars securedio the frame` by bolts, one of said bars having slots through which the bolts pass to permit longitudinal adj ustmen t,and transverse die-sections Whose extremities are respectively pivoted to the two l side bars; a pu nch attached to each trans-V verse section of the male mem ber, the punches of all the sections of this member being` arranged in a diagonalline across the spacebetween the two side' bars; the transverse diesections of the female member being provided 1 with holes arranged in a diagonal line across the space between the side bars, substantially as shown and described. y

3. In apparatus of the class described, the combination of male and female die members, each composed of a suitable frame, parallel side bars secured to the frame, one of the side bars being longitudinally adjustable, and ad justing-screws applied to theopposite ends of the adjustable bar, andtransverse diesections whose extremities are respectively pivoted to the side bars; the transverse sections of the male member, being each provided with a punch, the punches of all the sections being arranged diagonally across the space between the side bars; each transverse section of the female member having an opening,the series of openings, being arranged diagonally across the rectangular space between the side bars of the said member,whereby when the two die members are arranged in operative relation one above the other, the holes of the one member will register with the punches of the other member, substantially as described.

4. In apparatus for punching rivet-holes in sheet-metal pipe-sections, the combination of two cooperating die members, each composed of a chase or frame, two parallel longitudinal side bars secured to said frame, one of the bars being longitudinally adjustable, the said sde-bars having grooves formed in their in` ner edges, transverse die-sections interposed between the two side bars, and having tongues at their ends extending into the grooves or recesses of the bars, screw studs passed through registering openings formed in the side bars and the extremities of said sections,

whereby the latter are pivotally connected .with the side bars at both extremities; the

transverse sections of the male member hav- :ing a series of punches arranged in a diagonal line across the space between the side bars; the transverse sections of thefemale member having openings arranged in operative relation, substantially as described.

` 5. The combination of male and female die members, each composed of a suitable chase or frame, two parallel longitudinal side bars secured tothe frame, one of them being longitudinally adjustable, screws uthreaded in ,the frame and engaging the adjacent side bars at the side and both ends, and transverse die-sections whose extremities are respectively pivoted to the side bars; the transverse sections of the male member being provided with punches arranged in a diagonal line across the space between the -side bars; and the transverse sections of the female member having openings, the series of openings b eing arranged diagonally across the space between the side bars, and adapted to register with the punches of the male member when the two members are arranged in i operative relation one above the other, substantially as described.

6. A male stamping-die composed of a suitable frame,.parallel side bars secured to the frame, one of said barsbeing longitudinally adjustable, transverseA sections whose eX- tremities are respectively pivoted to the side bars, and punches mountedon the said sections and diagonally arranged across the space between the side bars, substantially as described.

7. A female die member composed of a suitable frame, parallel sidebars secured to the frame, one of the bars being adjustable longitudinally, and transverse die-sections located between the side bars and whose eX- tremities are respectively pivoted to the latter, each of the said die-sections having an opening, and the series of openings of the said sections being arranged diagonally across the space between the side bars, substantially as described.

In testimony whereof I affix my signature in presence of two witnesses.

GEORGE M. LIVINGSTONEL Witnesses:

e DENA NELSON,

A. J. OBRIEN.

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